Electric condenser



Dec. 6, 1938. L.- LINDER ELECTRIC CONDENSER Filed Aug. 15, 1936 V-VINVENTOIVR LUDWIG UNDER BY zz ATTORNEY Patented Dec. 6, 1938 UNITED STATES PA ENT OFFICE Siemens & Halske,

Aktiengesellschaft, SiemensstadigBerlin, Germany, a corporation of Germany Application August 15, 1936, Serial No. 96,198 In Germany August 15, 1935 9 Claims.

This invention relates to a novel electrical cndenser in rod or tubular form.

The rapid development of radio technology has increased the demand for properly balanced condensers, especially those of very small capacity values;

It, is known from the prior art that the capacity value of roll condensers, after their manufacture, may be varied by removal of portions of the coats, the parts to be so removed being pulled out of the roll or wrap and then shortened. How! ever, a method of this kind is liable to lead to damaging of the condenser to an extent where it is rendered unserviceable, especially in the case of electrical condensers where the metallic coats or foils are wound on a rodor tfibular form made denser coat is subdivided into strips which atone end are united comb-fashion, for instance, so that by the severance of such strips the capacity value is readily alterable.

One essential merit of the arrangement as here disclosed resides in the fact that the capacity balance or adjustment :1 to be effected only after the condenser body been completed so that undesirable changes in capacity and damage to the dielectric will not happen. I

One exemplified embodiment of the invention is illustrated in the drawing.

Fig. l shows schematically the development oi a condenser;

Fig. 1A is a condenser development similar to Fig. 1, except that both conductive strips are slotted and placed in staggered-relationship with each other;

Hg. 2 shows a bar-shaped condenser in eleva- I 45 tion comprising a portion of the coats .protruding from the condenser body.

The adjusting metallic coat I has one or more long slots 5 which project beyond the edge of the insulation material I serving as the dielec- 50 tric so that the coat I comprises several strips 6,

which strips'may have diilferent lengths projecting within the condenser body as shown to the left of Fig. 1. After the roll has been completed, in away as shown by short dash lines at Lanydesirednumberofstrlpsmaybesevend from the coat I until the desired capacity results. Also shown by Fig. 1A, the cooperative coat'2 could be'shaped in a similar way so that, if the two coats are suitably disposedgeometrically, for example, by that opposite strips of slots are staggered in reference to one another, a capacity balance in fine steps or gradations is feasible. 1 and 8 designate the terminal electrodes of coats I and. 2,

Referring to Fig-2, one coat, ID, has incised strips II, whereas the other coat I2 is continuous. I3 designates the resultant condenser body. It may be mentioned that the strips 6 as shown in Fig. 1 may also be made of dissimilar length and width.

What is claimed is:

'1. An electrical condenser comprising a first conducting strip,- a second conducting strip, at least one end portion of said conducting strips being slotted comb-shape, an insulating member interposed between said first and second conducting strips in a manner such that the closed side of the slotted portion extends beyond said insulating strip so that the condenser capacity may be adjusted by a severence of a part of the slotted portion.

2. An electrical condenser comprising a bar 7 on which is wound a first conducting strip, a second conducting strip, at least one end portion of said conducting strips being slotted combshape, an insulating member interposed between said first and secondconducting strips in a manner such that the closed side of the slotted portion extends beyond said insulating strip so that the condenser capacity may be adjusted by severence of a part of the slotted portion.

3. An electrical condenserhaving electrodes wound in tube form comprising a first conducting strip, a second conducting strip,-at least one end portion of said conducting strips being slotted comb-shape, an insulating tube-like member interposed between said'first and second conducting strips in a manner such that the closed side of the slotted portion extends beyond said insulating strip so that the condenser capacity may be 45 adjusted by severence of a part of the slotted portion.

4. An electrical condenser comprising a first conducting strip, a second conducting strip having one end portion slotted comb-shape, the slottedportionbeingarrangedsoas toproyide strips of conducting material of difierentlengthsaninsulating member interposed between said first and second strips in a manner such tiiottheclcoedldieofthe'siot'tedportions:-I

tends beyond said insulating strip so that the condenser capacity may be adjusted by severence of conducting material 0! diflerent widths, an

insulating member interposed between said first and second conducting strips in a manner such that the closed side of the slotted portion extends beyond said insulating strip so that the condenser capacity may be adjusted by severence of a part of the slotted portion.

6. An electrical condenser comprising two conducting strips, one end portion 01' each strip being slotted comb-shape, an insulating member interposed between said conducting strips, the slots in said conducting strips being in staggered relationship with respect to each other and having the slotted portion extending beyond said insulating strip so that the condenser capacity may be adjusted by se verence of a part of said slotted portion.

'7. An electrical condenser comprising a bar on which is wound two conducting strips having a plurality of conductor turns around said bar, at'least one end portion of said conducting strips being slotted comb Shaped, an insulating member interposed between said first and second conducting strips in a manner such that the closed side 01' the slotted portion extends beyond said insulating member so that the condenser capacity may be adjusted by severenw of a part oi the slotted portion.

8. An electrical condenser comprising a bar on which is wound two conducting strips having a single conductor turn around said bar, at least one end portion of said conducting strips being slotted comb-shaped, an insulating member interposed between said first and second conducting strips in a manner such that the closed side of the slotted portion extends beyond saidinsulating member so that the condenser capacity may be adjusted by severence of a part of the slotted portion.

9. An electrical condenser comprising a bar on which is wound two conducting strips having less than a single conductor turn around said bar, at least one end portion of said conducting strips being slotted comb-shaped, an insulating memher interposed between said first and second conducting strips in a manner such that the closed side of the slotted portion extends beyond said insulating member so that the condenser capacity may be adjusted by severence of a part of the slotted portion.

LUDWIG UNDER. 

